CN103003622A - Light source unit, back light unit, and thin display apparatus - Google Patents
Light source unit, back light unit, and thin display apparatus Download PDFInfo
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- CN103003622A CN103003622A CN2011800353830A CN201180035383A CN103003622A CN 103003622 A CN103003622 A CN 103003622A CN 2011800353830 A CN2011800353830 A CN 2011800353830A CN 201180035383 A CN201180035383 A CN 201180035383A CN 103003622 A CN103003622 A CN 103003622A
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- light source
- flexible printing
- patch panel
- source cell
- printing patch
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- 239000002184 metal Substances 0.000 claims abstract description 49
- 238000007639 printing Methods 0.000 claims description 86
- 239000000853 adhesive Substances 0.000 claims description 54
- 230000001070 adhesive effect Effects 0.000 claims description 54
- 239000000758 substrate Substances 0.000 claims description 20
- 238000009792 diffusion process Methods 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 7
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133601—Illuminating devices for spatial active dimming
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133628—Illuminating devices with cooling means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/64—Heat extraction or cooling elements
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Led Device Packages (AREA)
Abstract
A light source unit (100) switches one to a plurality of light source groups (P, Q, R), each comprising one to a plurality of light sources (110), on and off for each light source group or each light source. The light source unit (100) is provided with: a flexible printed wiring board (120); one to a plurality of light source groups (P, Q, R) mounted on a first surface of the flexible printed wiring board (120); and a metal support plate (130) attached to a second surface on the opposite side of the first surface of the flexible printed wiring board (120) via an adhesive layer (140). The coefficient of thermal conductivity of the adhesive layer (140) in the vertical direction is set so as to be smaller than the coefficient of thermal conductivity of a base material layer (121) of the flexible printed wiring board (120) in the vertical direction.
Description
Technical field
The panel display apparatus that the present invention relates to light source cell, has the back light unit of this light source cell and have this back light unit.
Background technology
Usually, adopt brightness height and the low cold-cathode fluorescence lamp (hereinafter, being called CCFL) of cost at the back light unit that is used for liquid crystal indicator.Yet light emitting diode (LED) development has in recent years improved the brightness of LED and has reduced cost.As a result, more CCFL(shortcoming is to contain mercury) replaced by LED.
At first, similar with the situation of CCFL at the back light unit of the employing LED that is used for liquid crystal indicator, LED continues illumination and utilizes liquid crystal light valve (shutter) to come adjustable colors and brightness.Yet, in order to reduce power consumption and to generate the pitch-dark color that is used for improving colorrendering quality, in the now more situation LED is carried out local switch (ON/OFF) control, that is, and local dimming (local dimming).
Term " local dimming " refers to following technology: the light exit surface of back light unit is divided into a plurality of zones, and accordingly luminous intensity control is carried out in each zone independently with the image that will show.
The luminous efficiency of LED raises along with temperature and reduces.Raise for fear of temperature, adopt the existing back light unit that continues illumination type LED to be formed by the improved material of thermal conductivity, in order to LED is remained on low temperature.In other words, by improving the heat dispersion of each LED, prevent that equably the temperature among the LED from raising.Therefore, come driving LED with the luminous efficiency of homogeneous.
In the back light unit of carrying out local dimming, LED is carried out local switch control.To compare temperature low so that remain on those LED and other LED under remaining on open mode under the closed condition for this.Therefore, if to the identical electric current of LED supply so that the identical brightness of luminous acquisition from remaining on the LED under the closed condition and remaining on other LED under the open mode, it is brighter than the light that sends from other LED that the light that then sends from the LED that remains under the closed condition becomes.This causes the brightness of LED there are differences, and this is disadvantageous.
For example, patent documentation 1 and patent documentation 2 disclose and have adopted this LED as the back light unit of backlight.
＜prior art document 〉
Patent documentation
Patent documentation 1: Japanese Laid-Open Patent communique No.2004-214094
Patent documentation 2: Japanese Laid-Open Patent communique No.2005-135862
Summary of the invention
＜the problem to be solved in the present invention 〉
The invention of describing in the patent documentation 1 relates to back lighting device and liquid crystal indicator.The advantage of these devices is: saved cost, improved the efficient of light from light source-guide to LGP, and strengthened the radiating effect of light source.
The invention of describing in the patent documentation 2 relates to the light unit.The advantage of this light unit is: by with light from light source guide to efficiently LGP and utilize LGP with irradiation on display board, guarantee thus on the display board bright and good demonstration.
Yet the light unit in the back lighting device in the patent documentation 1 or the patent documentation 2 does not all adopt local dimming.Therefore, patent documentation 1 or patent documentation 2 all do not provide description or the suggestion that can solve the local dimming problem that the brightness among the LED there are differences.
Therefore, the present invention aims to provide a kind of employing and can guarantee the even and light source cell of the improved local dimming of heat dispersion of brightness in the light source group, the panel display apparatus that has the back light unit of this light source cell and comprise this back light unit.
＜the scheme of dealing with problems 〉
According to a first aspect of the invention, provide a kind of light source cell that comprises one or more light source groups.Each light source group consists of by one or more light sources.Described light source cell carries out independently switch control to each light source group or each light source.Described light source cell also comprises flexible printing patch panel and metal profile.Described flexible printing patch panel forms by closing one or more conductive layers on the flexible substrate layer upper strata.Described flexible printing patch panel has first surface and the opposition side that is positioned at described first surface second.Described light source group is installed on the first surface of described flexible printing patch panel.Described metal profile utilizes adhesive phase to be attached on second of described flexible printing patch panel.Described metal profile is the matrix of described light source cell.The thermal conductivity of the substrate layer in the vertical direction of the described flexible printing patch panel of thermal conductivity ratio of described adhesive phase in the vertical direction is low.
In this structure, when the light source cell heat that produces in operation was passed to metal profile via flexible printing patch panel, the heat conduction of flexible printing patch panel and metal profile reduced.As a result, in operation heat fully diffusion in flexible printing patch panel before conducting to metal profile of generation of light source group.The unevenness of the Temperature Distribution in the flexible printing patch panel is reduced, and guarantee that heat conducts to metal profile gradually.
As a result, the heat of conduction distributes flexible printing patch panel equably from the light source group to flexible printing patch panel, and spreads to metal profile gradually.
Therefore, above-mentioned structure has been guaranteed: the brightness in the light source group in the light source cell of employing local dimming is even, and heat dispersion improves.
Preferably, can carry out to each light source of the arbitrary light source group in the described light source group that comprises a plurality of light sources switch control separate between the light source.
This structure has guaranteed that illumination has the more free degree, realizes a greater variety of illuminations thus.
The thermal conductivity of described adhesive phase in the vertical direction preferably be set to described flexible printing patch panel the substrate layer in the vertical direction thermal conductivity 30% to 80%.
This structure further effectively guaranteed in the light source group brightness evenly and heat dispersion improve.
Each light source preferably includes light emitting diode.
This structure has been guaranteed: the brightness that includes separately in the light source group of light emitting diode is even, and heat dispersion improves.This structure has also prevented owing to the raise luminous efficiency of each light emitting diode cause of temperature reduces, and so that light source cell is very energy-conservation and long service life.
Described conductive layer is preferably formed by a plurality of copper film layers; At least one deck in the described conductive layer preferably disconnects electrically with other parts, and as the heat dissipating layer of the heat diffusion that described light source is produced in operation in the described flexible printing patch panel.
In this structure, the heat that is transmitted to the flexible printing patch panel from the light source group evenly distributes in flexible printing patch panel more expeditiously.
According to a second aspect of the invention, provide a kind of back light unit, described back light unit adopts the light source cell in the first aspect.
This constitution realization following back light unit, this back light unit guaranteed in the light source group brightness evenly and heat dispersion improve.
According to a third aspect of the invention we, provide a kind of panel display apparatus, the described panel display apparatus Bian back light unit of second aspect.
This constitution realization following panel display apparatus, its guaranteed in the light source group brightness evenly and heat dispersion improve.
＜effect of the present invention 〉
Guaranteed according to light source cell of the present invention, the panel display apparatus that comprises the back light unit of this light source cell and have this back light unit: in the light source cell of carrying out local dimming, the brightness in the light source group is even, and heat dispersion improves.
Description of drawings
Fig. 1 is the perspective view that the integral body of back light unit according to an embodiment of the invention is shown;
Fig. 2 (a) is the longitudinal section that the light source cell among Fig. 1 is shown;
Fig. 2 (b) is the sectional elevation that the light source cell among Fig. 1 is shown;
Fig. 3 (a) is the schematic diagram that the heat in the existing light source cell is transmitted;
Fig. 3 (b) is the schematic diagram that transmits of the heat in the light source cell according to an embodiment of the invention;
Fig. 4 (a) is the sectional elevation that illustrates according to the light source cell of the first modified example of the present invention;
Fig. 4 (b) is the sectional elevation that illustrates according to the light source cell of the second modified example of the present invention; And
Fig. 5 is the sectional elevation that illustrates according to the light source cell of the 3rd modified example of the present invention.
The specific embodiment
Describe light source cell 100 according to an embodiment of the invention, have the back light unit 1 of light source cell 100 and the panel display apparatus with back light unit 1 below with reference to Fig. 1, Fig. 2 and Fig. 3.Below describe some embodiment of the present invention is shown simply, and do not limit the scope of claims.
As shown in Figure 1, back light unit 1 is arranged on the back side of liquid crystal display 300, and comprises four light source cells 100 and LGP 200.LGP 200 is towards the back side of liquid crystal display 300, and light is transmitted on the liquid crystal display 300.Each light source cell 100 all is side light type light source cells, and it is transmitted into the lower surface of light via LGP 200 in the LGP 200.
Each light source cell 100 all has a plurality of light source groups, and each light source group consists of by one or more light sources.Each light source cell 100 adopts local dimming, and in other words, 100 pairs of each light source groups of each light source cell are carried out independently switch control.
As shown in Figure 2, each light source cell 100 includes: light source 110, flexible printing patch panel 120, metal profile 130 and adhesive phase 140.
By using LED as light source 110, allow each light source cell 100 to save more energy and prolonged service life.
In the illustrated embodiment, as depicted in figs. 1 and 2, three the light source group P, Q, the R that include separately single source 110 form a light source cell 100.Be arranged to towards the lower surface of LGP 200 with reference to 1, four light source cell 100 of figure.
Form the light source group of each light source cell 100 and form for the light source 110 of each light source group for the light source cell 100 towards the lower surface of LGP 200, each person's quantity and comprising among the embodiment that the structure of position is not limited to illustrate like this, but can change as required.
Flexible printing patch panel 120 is connected to the external cable (not shown) electrically with light source 110, and the heat that light source group P, Q, R are produced in operation dissipates.
Specifically, flexible printing patch panel 120 is multi-layer sheet.By two double-faced flexible printing distributing boards are bonded together to form flexible printing patch panel 120, these two double-faced flexible printing distributing boards all are formed with conductive layer on opposite two surfaces of plate.
As shown in Figure 2, flexible printing patch panel 120 comprises: substrate layer 121, conductive layer 122, cover layer 123 and adhesive phase 124.
As plastic foil, adopt the film that is formed by flexible plastic.Specifically, plastic foil can be any suitable plastic foil, and for example polyimide film or polyester film need only this film and be often used as the plastic foil that forms flexible printing patch panel.
Specifically, preferably, plastic foil is not only soft but also very heat-resisting.For example, can preferably adopt polyamide-based plastic foil, polyimide-based plastic foil or poly-naphthalene diacid second diester plastic foils such as polyimides or polyamide-imides plastic foil.
The heat resistant plastice film can be any heat-resisting plastics, and for example polyimide resin or epoxy resin need only this material and is often used as the heat resistant plastice that forms flexible printing patch panel.More preferably, in order to form substrate layer 121, preferably adopt following material: this material guarantees that the thermal conductivity of substrate layer 121 in the vertical directions is approximately 0.12W/mK.
Preferably, the thickness of substrate layer 121 is approximately 5 μ m to 100 μ m.
Specifically, the first conductive layer 122a, the second conductive layer 122b and the 3rd conductive layer 122c are all as the circuit layout layer.The 4th conductive layer 122d is as heat dissipating layer.More particularly, the first conductive layer 122a is as the common cathode circuit wiring layer.The second conductive layer 122b and the 3rd conductive layer 123c are all as the anode circuit distributing board of controlling light source group P, Q, R.The 4th conductive layer 122d and other parts disconnect electrically, and as the heat dissipating layer of the heat diffusion that light source group P, Q, R are produced in operation in the flexible printing patch panel 120.
With reference to figure 2(a), each light source 110 all has the electrode (not shown) that is connected to electrically the first conductive layer 122a.This electrode also utilizes scolder H to be connected to electrically the second conductive layer 122b and the 3rd conductive layer 122c.The kind electrode (not shown) of light source 110 utilizes scolder H and blind hole B to link together electrically.
Use such as existing methods such as carrying out etching at conductive layer 122 forms the first conductive layer 122a to the four conductive layer 122d
In the illustrated embodiment, conductive metal film is formed by copper (Cu).Yet the material of conductive metal film is not limited to copper (Cu), and can be any suitable material, as long as this material is typically used as the metal of the conductive metal film that forms the conductive layer in the flexible printing patch panel
Preferably the thickness of conductive layer 122 is approximately 35 μ m.
Can use polyimide film or photonasty photoresist (resist) or liquid photoresist as cover layer
Preferably the thickness of cover layer 123 is approximately 5 μ m to 100 μ m.
As adhesive, can adopt imide or epoxy adhesive.This adhesive can be in sheet or gelatinous form, and perhaps in other words, this adhesive can be to be generally used for forming the multiple-plate any suitable form adhesive that comprises a plurality of bonding flexible printing patch panels.
Preferably, the thickness of adhesive phase 124 is approximately 5 μ m to 100 μ m.
In the illustrated embodiment, by utilizing adhesive phase 124 two flexible printing patch panels are glued together to consist of flexible printing patch panel 120, flexible printing patch panel 120 is multi-layer sheet.Yet the structure of flexible printing patch panel 120 is not limited among the embodiment like this, but can change as required.
Like this, but can change as required among the embodiment shown in the number of plies of the number of plies of conductive layer 122 or position and heat dissipating layer and position are not limited to.
In the illustrated embodiment, with the material of aluminium (Al) as metal profile 130.Yet the material of metal profile 130 is not limited to aluminium (Al), and can be any suitable material that is typically used as the metal profile that consists of light source cell.
Preferably, the thickness of metal profile 130 is approximately 3mm.
In the illustrated embodiment, the thermal conductivity of substrate layer 121 in the vertical directions of the thermal conductivity ratio flexible printing patch panel 120 of adhesive phase 140 in the vertical directions is low.Specifically, the thermal conductivity of adhesive phase 140 in the vertical directions be flexible printing patch panel 120 substrate layer 121 in the vertical directions thermal conductivity 30% to 80%.
As adhesive, can adopt epoxy radicals or acrylic based binders.Preferably form adhesive phase 140 with following epoxy radicals or acrylic based binders: make the thermal conductivity of adhesive phase 140 in the vertical directions be approximately 0.01W/mK to 1W/mK.
Preferably, the thickness of adhesive phase 140 is approximately 30 μ m.
As light source group P, when Q, the R heat that produces in operation is passed to metal profile 130 via flexible printing patch panel 120, this structure has suppressed the heat conduction between flexible printing patch panel 120 and the metal profile 130.
The heat that light source group P, Q, R produce in operation is fully diffusion in flexible printing patch panel 120 before conducting to metal profile 130.The unevenness of the Temperature Distribution in the flexible printing patch panel 120 is reduced, guarantee that simultaneously heat conducts to metal profile 130 gradually.
As a result, distribute equably in flexible printing patch panel 120 so that be transmitted to heat the flexible printing patch panel 120 from light source group P, Q, R, and little by little be diffused in the metal profile 130.
Therefore, in carry out each light source cell 100 of local dimming, guaranteed the brightness homogeneous of light source group P, Q, R, and improved heat dispersion.
As the operation of the embodiment that illustrates and the contrast of effect, below with reference to Fig. 3 (a) existing light source cell 400 is described.Parts at the same or analogous light source cell 400 of corresponding component of the light source cell 100 of structure and function aspects and embodiment adopt same or analogous Reference numeral.Here omitted the description to these parts.
Specifically, light source cell 400 adopts local dimming.The thermal conductivity of adhesive phase 440 in the vertical directions is low unlike the thermal conductivity of base layer 421 in the vertical directions of flexible printing patch panel 420.When the light source group P of hypothesis in the light source cell 400 open and light source group Q, when R closes, transmit to metal profile 430 partly the heat that light source group P produces in operation position under the light source group P from flexible printing patch panel 420, shown in the corresponding arrow among Fig. 3 (a).
This causes: in flexible printing patch panel 420, temperature is high in the zone under the light source group P that opens, and on the contrary, the temperature in the zone under light source group Q, the R that closes is low.In other words, the temperature characterisitic in the flexible printing patch panel 420 is different because of the position.
As a result, when light source group R switched to open mode from closed condition, the brightness in the light source cell 400 there are differences.Specifically, for so that light source group R is luminous with the brightness identical with the brightness of the light source group P that originally opened, supply identical electric current to light source group R and light source group P.In this state, the temperature of the light source group R that originally closed is relatively low.As a result, light source group R is luminous with the brightness higher than the brightness of light source group P, thereby causes the brightness in the light source cell 400 there are differences.
Fig. 3 (b) illustrates the light source cell 100 according to embodiment shown in the present, the light source cell 100 same local dimming that adopt.When light source group P opens and light source group Q, when R closes, prevents that the heat that light source group P produces in operation from transmitting to metal profile 130 partly from the position under the light source group P, shown in the arrow among Fig. 3 (b).
In other words, in operation heat fully diffusion in flexible printing patch panel 120 before conducting to metal profile 130 of generation of light source group P.This reduces the unevenness of the Temperature Distribution in the flexible printing patch panel 120, and guarantees that heat is gradually to metal profile 130 conduction.
As a result, flexible printing patch panel 120 all shows uniform temperature characterisitic at an arbitrary position.Therefore, if to the light source group P that originally opened and the identical electric current of light source group R supply of originally closing, so that light source group R is luminous with the brightness identical with the brightness of light source group P, prevented that then light source group R is luminous with relatively high brightness.Therefore, light source group P, R have identical brightness.
As a result, prevented that effectively each light source cell 100 has the luminance difference that causes owing to different temperature characterisitics.
Fig. 3 is and the similar cutaway view of Fig. 2 (a).Yet, for being shown effectively, heat transmits, not shown hatching among Fig. 3, and metal profile 130 is depicted as with flexible printing patch panel 120 separates in the drawings.
The 4th conductive layer 122d and other parts disconnect electrically, and as the heat dissipating layer of the heat diffusion that the light source group is produced in operation in the flexible printing patch panel 120.As a result, so that be delivered to heat the flexible printing patch panel 120 from light source group P and in flexible printing patch panel 120, further effectively evenly distribute.
In addition, the light source group P heat that produces in operation little by little is transmitted in the metal profile 130 and therefore diffusion.The luminous efficiency that has prevented like this LED reduces owing to temperature raises.
As a result, in each light source cell 100 that adopts local dimming, guaranteed that the brightness in the light source group is even, and improved heat dispersion.
Because light source cell 100 is to make light shine side light type light source cell on the LGP 200 via the lower surface of LGP 200, so that the thickness of back light unit 1 reduce.
Specifically, with reference to figure 1, the light that light source cell 100 sends is transferred in the LGP 200 via light-incident end 210.Light occurs in LGP 200 in the total reflection, from 220 outgoing of light exit side face and directive liquid crystal display 300.
As the material of LGP 200, can adopt such as any suitable materials such as plastics, as long as this material is generally used for forming LGP.
In the illustrated embodiment, back light unit 1 is configured to only have light source cell 100 and LGP 200.Yet back light unit 1 is not limited to this structure.Any appropriate parts that for example, such as reflective sheet or optical sheet etc. can be typically used as the parts of back light unit combine with light source cell 100 and LGP 200 and consist of back light unit 1.
Comprise among the size of size of liquid crystal display 300 and the structure embodiment that is not limited to illustrate like this, but change as required.
In the illustrated embodiment, adopt each light source cell 100 of local dimming to be configured to each light source group is carried out independently switch control.Specifically, light source cell 100 is made of three light source group P, Q, R, and light source group P, Q, R form by single source 110 separately.Each light source group P, Q, R are carried out independently switch control.Yet each light source cell 100 is not necessarily constructed by this way.
For example, adopt each light source cell 100 of local dimming can comprise the light source group that all has separately a plurality of light sources.Light source in each light source group is in parallel.So not only allow each light source group is carried out independently switch control, and allow each light source in each light source group is carried out independently switch control.Guaranteed like this to adopt the brightness of the brightness of the light source group in the light source cell of local dimming and the light source in each light source group even and heat dispersion is good.This structure also allows the free degree of throwing light on larger, guarantees that thus the kind of throwing light on is more.
Below, with reference to figure 4(a), Fig. 4 (b) and Fig. 5 describe the first modified example to the three modified examples according to the light source cell of embodiment shown in the present.
In the first modified example to the three modified examples, be used for the structure of adhesive phase that flexible printing patch panel and metal profile are glued together from aforementioned embodiment variant.The structure of other parts in the first modified example to the three modified examples is identical with the structure of the corresponding component of the embodiment that illustrates.Parts in same or analogous the first modified example to the of the corresponding component of structure and function aspects and embodiment three modified examples adopt same or analogous Reference numeral.Here omitted the description to these parts.
Below with reference to first modified example of Fig. 4 (a) description according to the light source cell of embodiment shown in the present.
In the first modified example, form adhesive phase 140 with the high-termal conductivity adhesive, and in adhesive phase 140, be dispersed with bubble (microvesicle) K.
In this structure, although used the high-termal conductivity adhesive, the thermal conductivity of substrate layer 121 in the vertical directions of the thermal conductivity ratio flexible printing patch panel 120 of adhesive phase 140 whole in the vertical directions is low.Specifically, the thermal conductivity of adhesive phase 140 whole in the vertical directions be substrate layer 121 in the vertical directions thermal conductivity 30% to 80%.
As a result, distribute equably in flexible printing patch panel 120 so that be transmitted to heat the flexible printing patch panel 120 from the light source group, and be diffused into gradually in the metal profile 130.
Therefore, adopt the light source cell 100 of local dimming to guarantee that the brightness in the light source group is even, and improved heat dispersion.
Below with reference to second modified example of Fig. 4 (b) description according to the light source cell of embodiment shown in the present.
In the second modified example, form adhesive phase 140 with the high-termal conductivity adhesive.Adhesive is applied to isolated position between flexible printing patch panel 120 and metal profile 130.
In this structure, although used the high-termal conductivity adhesive, the average conduction of adhesive phase 140 whole in the vertical directions is arranged to the little value of thermal conductivity than substrate layer 121 in the vertical directions of flexible printing patch panel 120.Specifically, the average conduction of adhesive phase 140 whole in the vertical directions be arranged to flexible printing patch panel 120 substrate layer 121 in the vertical directions thermal conductivity 30% to 80%.
As a result, the heat that is transmitted to the flexible printing patch panel 120 from the light source group distributes in flexible printing patch panel 120 equably, and is diffused into gradually in the metal profile 130.
Therefore, adopt each light source cell 100 of local dimming to guarantee that the brightness in the light source group is even, and improved heat dispersion.
Below with reference to three modified example of Fig. 5 description according to the light source cell of embodiment shown in the present.
In the 3rd modified example, form adhesive phase 140 with following adhesive: the thermal conductivity of this adhesive equal substrate layer 121 in the vertical directions thermal conductivity 30% to 80%.In adhesive phase 140, needle-like or flat little sheet metal M flatly align.
In this structure, the light source group produces and is passed to heat flatly conduction in adhesive phase 140 of adhesive phase 140, thus more effectively diffusion in operation.As a result, more effectively prevented along the heat conduction of the thickness direction of adhesive phase 140.In addition, prevented that more effectively heat is partly to metal profile 130 conduction.
As a result, more effectively distribute equably in flexible printing patch panel 120 so that be transmitted to heat the flexible printing patch panel 120 from the light source group, and be diffused into gradually in the metal profile 130.
Therefore, adopt each light source cell 100 of local dimming to guarantee that the brightness in the light source group is even, and more effectively improved heat dispersion.
Can be used in the little carbon plates such as CNT or graphite flake that flatly aligns in the adhesive phase 140 and replace little sheet metal M.
Can between flexible printing patch panel 120 and metal profile 130, graphite sheet be set.
The thermal conductivity of graphite sheet thermal conductivity ratio in the vertical direction in the horizontal direction is high.Therefore, in this structure, effectively evenly distribute at flexible printing patch panel 120 via the heat of flexible printing patch panel 120 to metal profile 130 conduction from the light source group, and be diffused into gradually in the metal profile 130.
＜example 〉
Below by example the present invention is described in more detail.Yet, the invention is not restricted to example.
As the light source cell that is used for 42 inches liquid crystal indicators, two light source cells with 54cm transverse width align along the vertical direction.Each light source cell includes 52 LED as light source.Per 4 LED hard wires form the light source group together, and jointly are controlled.13 light source groups that obtain are subject to control separate between the light source group (in the mode of local dimming).
As flexible printing patch panel, prepare to have the multi-layer sheet of four conductive layers, each conductive layer is the copper film of 35 μ m thickness.Topmost a conductive layer is the common cathode circuit wiring layer.Above second and the 3rd conductive layer be anode circuit wiring layer for 13 light source groups of control.The 4th conductive layer is the heat dissipating layer that is integrally formed to improve the uniform luminance performance by solid filler.Employing has the substrate layer of 0.5W/mK thermal conductivity.
As metal profile, use the aluminium sheet of wide 10mm, thick 3mm, long 54cm.
It is bonded to each other with flexible printing patch panel and metal profile that utilization has the adhesive phase of 0.2W/mK thermal conductivity and 30 μ m thickness.Adhesive phase forms with epoxy adhesive.
Prepare relatively to use light source cell, in this light source cell, only adhesive phase is configured to different from above-mentioned adhesive phase.Relatively using in the light source cell, utilizing the adhesive phase with 50W/mK thermal conductivity and 30 μ m thickness that flexible printing patch panel and metal profile is bonded to each other.Adhesive phase forms with silver paste.
Some light source groups are illuminated partly, and by the Temperature Distribution in the hot display affirmation light source group.Have in the light source cell of adhesive of 0.2W/mK thermal conductivity in use, mean temperature is relatively high, and the temperature difference less between the LED.In this light source cell, confirmed that flexible printing patch panel has reduced the unevenness of the Temperature Distribution in the flexible printing patch panel effectively.
On the contrary, relatively the using in the light source cell of adhesive that employing has the 50W/mK thermal conductivity, mean temperature is relatively low, and the temperature difference between the LED is relatively large.In this light source cell, the brightness of LED of having confirmed to continue from the brightness ratio that closed condition switches to the LED of open mode the state that stays open is high.
As a result, confirmed realized that effectively the brightness in the light source group is even, and heat dispersion to improve by adopting according to structure of the present invention.
Claims (7)
1. light source cell that comprises one or more light source groups, each light source group consists of by one or more light sources, and described light source cell carries out independently switch control to each light source group or each light source, and described light source cell is characterised in that:
Flexible printing patch panel, it forms by closing one or more conductive layers on the flexible substrate layer upper strata, described flexible printing patch panel has first surface and the opposition side that is positioned at described first surface second, and wherein, described light source group is installed on the first surface of described flexible printing patch panel; And
Metal profile, it utilizes adhesive phase to be attached on second of described flexible printing patch panel, and described metal profile is the matrix of described light source cell,
Wherein, the thermal conductivity of the substrate layer in the vertical direction of the described flexible printing patch panel of thermal conductivity ratio of described adhesive phase in the vertical direction is low.
2. light source cell according to claim 1 is characterized in that:
Can carry out to each light source of the arbitrary light source group in the described light source group that comprises a plurality of light sources switch control separate between the light source.
3. light source cell according to claim 1 and 2 is characterized in that:
The thermal conductivity of described adhesive phase in the vertical direction be set to described flexible printing patch panel the substrate layer in the vertical direction thermal conductivity 30% to 80%.
4. light source cell according to claim 1 and 2 is characterized in that:
Each light source includes light emitting diode.
5. light source cell according to claim 1 and 2 is characterized in that:
Described conductive layer is formed by a plurality of copper film layers,
At least one deck and other parts in the described conductive layer disconnect electrically, and as the heat dissipating layer of the heat diffusion that described light source is produced in operation in the described flexible printing patch panel.
6. back light unit is characterized in that:
Adopt light source cell according to claim 1 and 2.
7. panel display apparatus is characterized in that:
Bian back light unit according to claim 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-225906 | 2010-10-05 | ||
| JP2010225906A JP2012079626A (en) | 2010-10-05 | 2010-10-05 | Light source unit, backlight unit and flat display device |
| PCT/JP2011/062980 WO2012046473A1 (en) | 2010-10-05 | 2011-06-06 | Light source unit, backlight unit, and flat panel display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103003622A true CN103003622A (en) | 2013-03-27 |
Family
ID=45927474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800353830A Pending CN103003622A (en) | 2010-10-05 | 2011-06-06 | Light source unit, back light unit, and thin display apparatus |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20130083513A1 (en) |
| JP (1) | JP2012079626A (en) |
| KR (1) | KR20130114582A (en) |
| CN (1) | CN103003622A (en) |
| DE (1) | DE112011103356T5 (en) |
| TW (1) | TW201216536A (en) |
| WO (1) | WO2012046473A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696924A (en) * | 2013-12-05 | 2015-06-10 | 苏州承源光电科技有限公司 | Anti-static LED radiating substrate |
| CN104791626A (en) * | 2015-04-15 | 2015-07-22 | 东莞市闻誉实业有限公司 | Advertising lamp |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104317088B (en) * | 2014-10-22 | 2017-08-11 | 京东方科技集团股份有限公司 | A kind of backlight module and display device |
| JP2017152450A (en) * | 2016-02-22 | 2017-08-31 | 大日本印刷株式会社 | LED display device |
| WO2019190026A1 (en) * | 2018-03-26 | 2019-10-03 | 주식회사 루멘스 | Quantum dot plate assembly, light-emitting device package comprising same, and led module |
| KR102561705B1 (en) * | 2018-08-13 | 2023-08-01 | 주식회사 루멘스 | Light emitting diode package and manufacturing method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3991358B2 (en) | 2003-01-07 | 2007-10-17 | ソニー株式会社 | Backlight device and liquid crystal display device |
| JP4383145B2 (en) | 2003-10-31 | 2009-12-16 | オプトレックス株式会社 | Light unit |
| JP4573128B2 (en) * | 2006-03-14 | 2010-11-04 | ミネベア株式会社 | Surface lighting device |
| JP4238921B2 (en) * | 2006-11-14 | 2009-03-18 | エプソンイメージングデバイス株式会社 | LIGHTING DEVICE, ELECTRO-OPTICAL DEVICE, AND ELECTRONIC DEVICE |
| JP5276945B2 (en) * | 2008-09-30 | 2013-08-28 | 昭和電工株式会社 | Display device and light emitting device |
| EP2597354B1 (en) * | 2010-07-20 | 2016-12-28 | Panasonic Intellectual Property Management Co., Ltd. | Lightbulb shaped lamp |
-
2010
- 2010-10-05 JP JP2010225906A patent/JP2012079626A/en active Pending
-
2011
- 2011-06-06 WO PCT/JP2011/062980 patent/WO2012046473A1/en active Application Filing
- 2011-06-06 DE DE112011103356T patent/DE112011103356T5/en not_active Withdrawn
- 2011-06-06 US US13/704,597 patent/US20130083513A1/en not_active Abandoned
- 2011-06-06 KR KR1020127031973A patent/KR20130114582A/en not_active Application Discontinuation
- 2011-06-06 CN CN2011800353830A patent/CN103003622A/en active Pending
- 2011-07-19 TW TW100125425A patent/TW201216536A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696924A (en) * | 2013-12-05 | 2015-06-10 | 苏州承源光电科技有限公司 | Anti-static LED radiating substrate |
| CN104791626A (en) * | 2015-04-15 | 2015-07-22 | 东莞市闻誉实业有限公司 | Advertising lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20130114582A (en) | 2013-10-17 |
| WO2012046473A1 (en) | 2012-04-12 |
| US20130083513A1 (en) | 2013-04-04 |
| DE112011103356T5 (en) | 2013-08-01 |
| TW201216536A (en) | 2012-04-16 |
| JP2012079626A (en) | 2012-04-19 |
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Application publication date: 20130327 |